Bengals off leash should never be allowed outside, for all of the reasons that any cat shouldn’t be outside, not to mention the abundance of coyotes in Southern Ca. Bengals are also, sadly, a cat that is quickly snatched if left unattended by pet thieves.
There is a significant chance of death if a Bengal cat is put under with Ketamine. If anesthesia is required for future surgery, make sure to tell your vet about this because it isn't something most vets know because it isn't true for most cats. Bengals have a unique intolerance for this anesthesia.
Besides the fact that if you don't spay/neuter your sweet kitten will end up spraying urine in your home.... Intact males spray constantly to attract females, once they come into sexual maturity. Intact Females also spray when in heat every several weeks.
During the 1st week the kitten should be confined to a small space, like a bathroom. She won't know where food & litter are, so having a small space allows her to find her way. After the first 5-7 days, you can expand her world to the entire home as by then she'll know where her necessities are located.